A step-down transformer is used on a `1000 V` line to deliver `20A` at `120V` at the secondary coil. If the efficiency of the transformer is `80%` the current drawn from the line is.A. 3AB. 30 AC. 0.3AD. 2.4 V

A step-down transformer is used on a `1000 V` line to deliver `20A` at

1.	A step-down transformer is used on a `1000 V` line to deliver `20A` at `120V` at the secondary coil. If the efficiency of the transformer is `80%` the current drawn from the line is.A. 3AB. 30 AC. 0.3AD. 2.4 V
Answer» Correct Answer - A `eta = ("Output Power")/("Input Power")` `rArr 80/100 = (20 xx 120)/(1000 xx I)` `rArr I=(20 xx 120xx100)/(1000 xx I)` `rArr I = (20 xx 120 xx 100)/(1000 xx 80) = 3A`

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A step-down transformer is used on a `1000 V` line to deliver `20A` at `120V` at the secondary coil. If the efficiency of the transformer is `80%` the current drawn from the line is.A. 3AB. 30 AC. 0.3AD. 2.4 V

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